一种等值面的折射体绘制方法

摘要

折射能增强体绘制图像的空间层次感和真实感.但是体数据中的噪声严重影响了绘制质量,而滤波又会造成绘制物体的几何变形和细节的损失.本文提出了一种等值面的折射体绘制方法.在绘制前,采用改进的基于曲率的PM滤波模型,用于噪声的平滑.在绘制时,通过设定阈值来消除等值面的重复折射现象.实验结果表明,本文方法采样点的错分率明显低于其他方法,绘制质量得到了显著的提高,同时几何变形和细节损失减少.%Refractive effects in volume rendering can enhance the realism of volume graphics,but the quality of resultant images is highly sensitive to noises.Filtering can suppress noises,but it results in geometrical distortion and loss of structural details.This paper presents an isosurface refractive volume rendering method is proposed for display of iso-surfaces.An improved curvature PM filter is used to smooth the volume dataset to suppress noises before the dataset is rendered.A threshold is used to eliminate multiple refractions in the close proximity of iso-surfaces when the dataset is rendered.Experiments show that misclassification rates of samplings are less than the ones with other methods, the quality of resultant images is enhanced.Meanwhile, the geometrical distortion and the loss of structural details are decreased.